Deadly officer-involved shootings of two black men, one in Louisiana and another in Minnesota, have the attention of the country and that of the Black Lives Matter movement. Sunday night, a group here in Memphis marched across the city and onto the I-40 bridge. It started as a peaceful rally at FedExForum with hundreds of people. After rallying at FedExForum, the crowd marched to police headquarters at 201 Poplar and then continued on, with more people joining them as they went on. The marchers attempted to go to the I-40 bridge, but police blocked the entrance to the bridge. They...